Warning: Creating default object from empty value in /home/egskil/public_html/blocks/navigation/block_navigation.php on line 198

Strict Standards: Declaration of question_calculated_qtype::get_actual_response() should be compatible with default_questiontype::get_actual_response($question, $state) in /home/egskil/public_html/question/type/calculated/questiontype.php on line 2162

Strict Standards: Declaration of question_calculated_qtype::print_question_grading_details() should be compatible with default_questiontype::print_question_grading_details(&$question, &$state, $cmoptions, $options) in /home/egskil/public_html/question/type/calculated/questiontype.php on line 2162

Strict Standards: Declaration of description_qtype::print_question() should be compatible with default_questiontype::print_question(&$question, &$state, $number, $cmoptions, $options, $context = NULL) in /home/egskil/public_html/question/type/description/questiontype.php on line 93

Strict Standards: Declaration of question_match_qtype::get_all_responses() should be compatible with default_questiontype::get_all_responses(&$question, &$state) in /home/egskil/public_html/question/type/match/questiontype.php on line 542

Strict Standards: Declaration of question_match_qtype::compare_responses() should be compatible with default_questiontype::compare_responses(&$question, $state, $teststate) in /home/egskil/public_html/question/type/match/questiontype.php on line 542

Strict Standards: Declaration of embedded_cloze_qtype::compare_responses() should be compatible with default_questiontype::compare_responses(&$question, $state, $teststate) in /home/egskil/public_html/question/type/multianswer/questiontype.php on line 728

Strict Standards: Declaration of question_multichoice_qtype::compare_responses() should be compatible with default_questiontype::compare_responses(&$question, $state, $teststate) in /home/egskil/public_html/question/type/multichoice/questiontype.php on line 549

Strict Standards: Declaration of question_shortanswer_qtype::compare_responses() should be compatible with default_questiontype::compare_responses(&$question, $state, $teststate) in /home/egskil/public_html/question/type/shortanswer/questiontype.php on line 412

Strict Standards: Declaration of question_shortanswer_qtype::test_response() should be compatible with default_questiontype::test_response(&$question, &$state, $answer) in /home/egskil/public_html/question/type/shortanswer/questiontype.php on line 412

Strict Standards: Declaration of question_numerical_qtype::has_wildcards_in_responses() should be compatible with question_shortanswer_qtype::has_wildcards_in_responses($question, $subqid) in /home/egskil/public_html/question/type/numerical/questiontype.php on line 39

Strict Standards: Declaration of question_numerical_qtype::compare_responses() should be compatible with question_shortanswer_qtype::compare_responses($question, $state, $teststate) in /home/egskil/public_html/question/type/numerical/questiontype.php on line 39

Strict Standards: Declaration of question_numerical_qtype::test_response() should be compatible with question_shortanswer_qtype::test_response(&$question, $state, $answer) in /home/egskil/public_html/question/type/numerical/questiontype.php on line 39

Strict Standards: Declaration of random_qtype::get_actual_response() should be compatible with default_questiontype::get_actual_response($question, $state) in /home/egskil/public_html/question/type/random/questiontype.php on line 384

Strict Standards: Declaration of random_qtype::print_question() should be compatible with default_questiontype::print_question(&$question, &$state, $number, $cmoptions, $options, $context = NULL) in /home/egskil/public_html/question/type/random/questiontype.php on line 384

Strict Standards: Declaration of question_truefalse_qtype::compare_responses() should be compatible with default_questiontype::compare_responses(&$question, $state, $teststate) in /home/egskil/public_html/question/type/truefalse/questiontype.php on line 311

Deprecated: Non-static method PEAR::setErrorHandling() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 63

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2339

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2340

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2341

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2342

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2343

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2344

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2345

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2346

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2347

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2348

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2349

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2350

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2351

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2352

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2353

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2354

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2355

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2356

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2357

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2358

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2359

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2360

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2361

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2362

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2363

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2364

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2365

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2366

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2367

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2368

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2369

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2370

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2371

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2372

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2373

Deprecated: Non-static method HTML_QuickForm::registerElementType() should not be called statically, assuming $this from incompatible context in /home/egskil/public_html/lib/formslib.php on line 2374

Strict Standards: Declaration of repository_instance_form::validation() should be compatible with moodleform::validation($data, $files) in /home/egskil/public_html/repository/lib.php on line 1763

Strict Standards: Declaration of repository_local::get_listing() should be compatible with repository::get_listing($path = '', $page = '') in /home/egskil/public_html/repository/local/lib.php on line 172

Strict Standards: Declaration of repository_recent::type_config_form() should be compatible with repository::type_config_form($mform, $classname = 'repository') in /home/egskil/public_html/repository/recent/lib.php on line 222

Strict Standards: Declaration of repository_upload::get_listing() should be compatible with repository::get_listing($path = '', $page = '') in /home/egskil/public_html/repository/upload/lib.php on line 197

Strict Standards: Declaration of repository_user::get_listing() should be compatible with repository::get_listing($path = '', $page = '') in /home/egskil/public_html/repository/user/lib.php on line 135

Warning: Creating default object from empty value in /home/egskil/public_html/blocks/settings/block_settings.php on line 132
Lesa - skrifa - spjalla: Hver er munurinn á gosinu í Grímsvötnum og Eyjafjallajökli?

Hver er munurinn á gosinu í Grímsvötnum og Eyjafjallajökli?

Frétt af fréttavefnum Vísi þann 28. maí 2011

 

Aska úr Grímsvatnagosinu og truflanir á flugsamgöngum í Evrópu vegna öskufalls hafa orðið mörgum tilefni til þess að bera það saman við gosið í Eyjafjallajökli í fyrra. Þó að afleiðingarnar séu um margt líkar eru gosin þó talsvert ólík, að sögn Páls Einarssonar, prófessors í jarðeðlisfræði.

„Í fyrsta lagi eru þetta mjög ólík eldfjöll. Grímsvötn er basalteldfjall og eitt af virkustu eldfjöllunum hér á landi. Það er á flekaskilunum sem liggja í gegnum landið og hefur gosið mjög oft. Það er eitt af okkar virkustu. Eyjafjallajökull er hins vegar eitt af latari fjöllunum og hefur gosið mjög sjaldan og aldrei mjög dramatískt. Það eru ekki þekkt nein hamfaragos úr því eldfjalli."

Páll segir kvikuna úr Eyjafjallajökli oft vera það sem kallist þróuð kvika, sem hafi allt aðra eiginleika en basaltkvikan sem kemur úr Grímsvötnum. „Hún er seigari og gasríkari og þess vegna miklu sprengjuvirkari, en það er helsti munurinn á þessum tveimur skepnum. Í gosinu í Eyjafjallajökli var askan miklu fínkornóttari vegna þess að sprengivirknin var miklu meiri og því fór askan í mun minni agnir. Það gerir hana erfiða viðfangs þar sem hún hangir mikið lengur í andrúmsloftinu en gerist með grófkorna ösku líkt og kemur frá Grímsvötnum."

Páll segir að það sé ein af útskýringunum á því af hverju Grímsvatnagos hafði takmarkaðri áhrif á flugsamgöngur, en margt fleira komi þó til. „Aðstæður í fyrra voru allt aðrar og það var samkrull af mörgum aðstæðum sem varð til þess að það gos olli svo miklu tjóni, meðal annars veðrið. Það var stífur vindur á meðan á gosinu stóð þannig að askan fór beint þangað sem hún gat valdið mestu tjóni. Svo hélt það áfram óvenju lengi og dældi ösku dag eftir dag.

Gosið núna í Grímsvötnum byrjar með miklum látum og er miklu stærra gos í raun og veru, en stendur stutt yfir þar sem erfiðasti fasinn er sennilega nú um garð genginn þó að gosið sé ekki alveg búið.

Páll segir þó að Grímsvatnagosið hafi ekki verið alveg eftir bókinni. „Það sem kemur okkur verulega á óvart er hvað það er gríðarlega stórt, því að við höfðum frekar gert ráð fyrir að það yrði eins og í síðustu þremur Grímsvatnagosum, sem öll hafa verið frekar lítil og meinlaus. Það fór svolítið fram úr okkur þar."

Hann segir þó ljóst að bæði gosin hafi verið afar lærdómsrík og hafi bætt miklu við þekkingu fræðimanna og viðbragðsaðila.

 

Heimild:http://www.visir.is/hver-er-munurinn-a-gosinu-i-grimsvotnum-og-eyjafjallajokli-/article/2011705289947

Síðast breytt: mivikudagur, 20 jl 2011, 12:50 eh